1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 1991, 1992 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #undef FFS /* Some systems predefine this symbol; don't let it interfere. */
24 #undef FLOAT /* Likewise. */
25 #undef ABS /* Likewise. */
26 #undef PC /* Likewise. */
28 /* Register Transfer Language EXPRESSIONS CODES */
30 #define RTX_CODE enum rtx_code
33 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
34 #include "rtl.def" /* rtl expressions are documented here */
37 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
39 Assumes default enum value assignment. */
41 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
42 /* The cast here, saves many elsewhere. */
44 extern int rtx_length[];
45 #define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)])
47 extern char *rtx_name[];
48 #define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)])
50 extern char *rtx_format[];
51 #define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)])
53 extern char rtx_class[];
54 #define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)])
56 /* Common union for an element of an rtx. */
58 typedef union rtunion_def
64 struct rtvec_def *rtvec;
65 enum machine_mode rttype;
68 /* RTL expression ("rtx"). */
70 typedef struct rtx_def
72 #ifdef ONLY_INT_FIELDS
74 unsigned int code : 16;
79 /* The kind of expression this is. */
80 enum rtx_code code : 16;
82 /* The kind of value the expression has. */
83 #ifdef ONLY_INT_FIELDS
86 enum machine_mode mode : 8;
88 /* 1 in an INSN if it can alter flow of control
89 within this function. Not yet used! */
90 unsigned int jump : 1;
91 /* 1 in an INSN if it can call another function. Not yet used! */
92 unsigned int call : 1;
93 /* 1 in a MEM or REG if value of this expression will never change
94 during the current function, even though it is not
96 1 in a SUBREG if it is from a promoted variable that is unsigned.
97 1 in a SYMBOL_REF if it addresses something in the per-function
99 1 in a CALL_INSN if it is a const call.
100 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
101 reorg until end of compilation; cleared before used. */
102 unsigned int unchanging : 1;
103 /* 1 in a MEM expression if contents of memory are volatile.
104 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
106 1 in a REG expression if corresponds to a variable declared by the user.
107 0 for an internally generated temporary.
108 In a SYMBOL_REF, this flag is used for machine-specific purposes.
109 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
110 unsigned int volatil : 1;
111 /* 1 in a MEM referring to a field of a structure (not a union!).
112 0 if the MEM was a variable or the result of a * operator in C;
113 1 if it was the result of a . or -> operator (on a struct) in C.
114 1 in a REG if the register is used only in exit code a loop.
115 1 in a SUBREG expression if was generated from a variable with a
117 1 in a CODE_LABEL if the label is used for nonlocal gotos
118 and must not be deleted even if its count is zero.
119 1 in a LABEL_REF if this is a reference to a label outside the
121 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
122 together with the preceding insn. Valid only within sched.
123 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
124 from the target of a branch. Valid from reorg until end of compilation;
125 cleared before used. */
126 unsigned int in_struct : 1;
127 /* 1 if this rtx is used. This is used for copying shared structure.
128 See `unshare_all_rtl'.
129 In a REG, this is not needed for that purpose, and used instead
130 in `leaf_renumber_regs_insn'.
131 In a SYMBOL_REF, means that emit_library_call
132 has used it as the function. */
133 unsigned int used : 1;
134 /* Nonzero if this rtx came from procedure integration.
135 In a REG, nonzero means this reg refers to the return value
136 of the current function. */
137 unsigned integrated : 1;
138 /* The first element of the operands of this rtx.
139 The number of operands and their types are controlled
140 by the `code' field, according to rtl.def. */
144 /* Add prototype support. */
146 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
147 #define PROTO(ARGS) ARGS
149 #define PROTO(ARGS) ()
153 #define NULL_RTX (rtx) 0
155 /* Define a generic NULL if one hasn't already been defined. */
162 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
163 #define GENERIC_PTR void *
165 #define GENERIC_PTR char *
170 #define NULL_PTR ((GENERIC_PTR)0)
173 /* Define macros to access the `code' field of the rtx. */
175 #ifdef SHORT_ENUM_BUG
176 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
177 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
179 #define GET_CODE(RTX) ((RTX)->code)
180 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
183 #define GET_MODE(RTX) ((RTX)->mode)
184 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
186 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
187 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
189 /* RTL vector. These appear inside RTX's when there is a need
190 for a variable number of things. The principle use is inside
191 PARALLEL expressions. */
193 typedef struct rtvec_def{
194 unsigned num_elem; /* number of elements */
198 #define NULL_RTVEC (rtvec) 0
200 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
201 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
203 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
205 /* 1 if X is a REG. */
207 #define REG_P(X) (GET_CODE (X) == REG)
209 /* 1 if X is a constant value that is an integer. */
211 #define CONSTANT_P(X) \
212 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
213 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
214 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
216 /* General accessor macros for accessing the fields of an rtx. */
218 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
219 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
220 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
221 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
222 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
223 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
224 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
226 /* ACCESS MACROS for particular fields of insns. */
228 /* Holds a unique number for each insn.
229 These are not necessarily sequentially increasing. */
230 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
232 /* Chain insns together in sequence. */
233 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
234 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
236 /* The body of an insn. */
237 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
239 /* Code number of instruction, from when it was recognized.
240 -1 means this instruction has not been recognized yet. */
241 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
243 /* Set up in flow.c; empty before then.
244 Holds a chain of INSN_LIST rtx's whose first operands point at
245 previous insns with direct data-flow connections to this one.
246 That means that those insns set variables whose next use is in this insn.
247 They are always in the same basic block as this insn. */
248 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
250 /* 1 if insn has been deleted. */
251 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
253 /* 1 if insn is a call to a const function. */
254 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
256 /* 1 if insn is a branch that should not unconditionally execute its
257 delay slots, i.e., it is an annulled branch. */
258 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
260 /* 1 if insn is in a delay slot and is from the target of the branch. If
261 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
262 executed if the branch is taken. For annulled branches with this bit
263 clear, the insn should be executed only if the branch is not taken. */
264 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
266 /* Holds a list of notes on what this insn does to various REGs.
267 It is a chain of EXPR_LIST rtx's, where the second operand
268 is the chain pointer and the first operand is the REG being described.
269 The mode field of the EXPR_LIST contains not a real machine mode
270 but a value that says what this note says about the REG:
271 REG_DEAD means that the value in REG dies in this insn (i.e., it is
272 not needed past this insn). If REG is set in this insn, the REG_DEAD
273 note may, but need not, be omitted.
274 REG_INC means that the REG is autoincremented or autodecremented.
275 REG_EQUIV describes the insn as a whole; it says that the
276 insn sets a register to a constant value or to be equivalent to
277 a memory address. If the
278 register is spilled to the stack then the constant value
279 should be substituted for it. The contents of the REG_EQUIV
280 is the constant value or memory address, which may be different
281 from the source of the SET although it has the same value.
282 REG_EQUAL is like REG_EQUIV except that the destination
283 is only momentarily equal to the specified rtx. Therefore, it
284 cannot be used for substitution; but it can be used for cse.
285 REG_RETVAL means that this insn copies the return-value of
286 a library call out of the hard reg for return values. This note
287 is actually an INSN_LIST and it points to the first insn involved
288 in setting up arguments for the call. flow.c uses this to delete
289 the entire library call when its result is dead.
290 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
291 of the library call and points at the one that has the REG_RETVAL.
292 REG_WAS_0 says that the register set in this insn held 0 before the insn.
293 The contents of the note is the insn that stored the 0.
294 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
295 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
296 REG_NONNEG means that the register is always nonnegative during
297 the containing loop. This is used in branches so that decrement and
298 branch instructions terminating on zero can be matched. There must be
299 an insn pattern in the md file named `decrement_and_branch_until_zero'
300 or else this will never be added to any instructions.
301 REG_NO_CONFLICT means there is no conflict *after this insn*
302 between the register in the note and the destination of this insn.
303 REG_UNUSED identifies a register set in this insn and never used.
304 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
305 CC0, respectively. Normally, these are required to be consecutive insns,
306 but we permit putting a cc0-setting insn in the delay slot of a branch
307 as long as only one copy of the insn exists. In that case, these notes
308 point from one to the other to allow code generation to determine what
309 any require information and to properly update CC_STATUS.
310 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
311 say that the CODE_LABEL contained in the REG_LABEL note is used
313 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
314 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
315 (write after write) dependencies. Data dependencies, which are the only
316 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
318 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
320 /* Don't forget to change reg_note_name in rtl.c. */
321 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
322 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
323 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
324 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
325 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };
327 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
328 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
329 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
331 /* Names for REG_NOTE's in EXPR_LIST insn's. */
333 extern char *reg_note_name[];
334 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
336 /* The label-number of a code-label. The assembler label
337 is made from `L' and the label-number printed in decimal.
338 Label numbers are unique in a compilation. */
339 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
341 #define LINE_NUMBER NOTE
343 /* In a NOTE that is a line number, this is a string for the file name
344 that the line is in. We use the same field to record block numbers
345 temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
346 (We avoid lots of casts between ints and pointers if we use a
347 different macro for the bock number.) */
349 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
350 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
352 /* In a NOTE that is a line number, this is the line number.
353 Other kinds of NOTEs are identified by negative numbers here. */
354 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
356 /* Codes that appear in the NOTE_LINE_NUMBER field
357 for kinds of notes that are not line numbers.
359 Notice that we do not try to use zero here for any of
360 the special note codes because sometimes the source line
361 actually can be zero! This happens (for example) when we
362 are generating code for the per-translation-unit constructor
363 and destructor routines for some C++ translation unit.
365 If you should change any of the following values, or if you
366 should add a new value here, don't forget to change the
367 note_insn_name array in rtl.c. */
369 /* This note is used to get rid of an insn
370 when it isn't safe to patch the insn out of the chain. */
371 #define NOTE_INSN_DELETED -1
372 #define NOTE_INSN_BLOCK_BEG -2
373 #define NOTE_INSN_BLOCK_END -3
374 #define NOTE_INSN_LOOP_BEG -4
375 #define NOTE_INSN_LOOP_END -5
376 /* This kind of note is generated at the end of the function body,
377 just before the return insn or return label.
378 In an optimizing compilation it is deleted by the first jump optimization,
379 after enabling that optimizer to determine whether control can fall
380 off the end of the function body without a return statement. */
381 #define NOTE_INSN_FUNCTION_END -6
382 /* This kind of note is generated just after each call to `setjmp', et al. */
383 #define NOTE_INSN_SETJMP -7
384 /* Generated at the place in a loop that `continue' jumps to. */
385 #define NOTE_INSN_LOOP_CONT -8
386 /* Generated at the start of a duplicated exit test. */
387 #define NOTE_INSN_LOOP_VTOP -9
388 /* This marks the point immediately after the last prologue insn. */
389 #define NOTE_INSN_PROLOGUE_END -10
390 /* This marks the point immediately prior to the first epilogue insn. */
391 #define NOTE_INSN_EPILOGUE_BEG -11
392 /* Generated in place of user-declared labels when they are deleted. */
393 #define NOTE_INSN_DELETED_LABEL -12
394 /* This note indicates the start of the real body of the function,
395 i.e. the point just after all of the parms have been moved into
397 #define NOTE_INSN_FUNCTION_BEG -13
400 #if 0 /* These are not used, and I don't know what they were for. --rms. */
401 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
402 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
403 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
404 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
405 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
408 /* Names for NOTE insn's other than line numbers. */
410 extern char *note_insn_name[];
411 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
413 /* The name of a label, in case it corresponds to an explicit label
414 in the input source code. */
415 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
417 /* In jump.c, each label contains a count of the number
418 of LABEL_REFs that point at it, so unused labels can be deleted. */
419 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
421 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
422 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
423 be decremented and possibly the label can be deleted. */
424 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
426 /* Once basic blocks are found in flow.c,
427 each CODE_LABEL starts a chain that goes through
428 all the LABEL_REFs that jump to that label.
429 The chain eventually winds up at the CODE_LABEL; it is circular. */
430 #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
432 /* This is the field in the LABEL_REF through which the circular chain
433 of references to a particular label is linked.
434 This chain is set up in flow.c. */
436 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
438 /* Once basic blocks are found in flow.c,
439 Each LABEL_REF points to its containing instruction with this field. */
441 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
443 /* For a REG rtx, REGNO extracts the register number. */
445 #define REGNO(RTX) ((RTX)->fld[0].rtint)
447 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
448 is the current function's return value. */
450 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
452 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
453 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
455 /* For a CONST_INT rtx, INTVAL extracts the integer. */
457 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
459 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
460 SUBREG_WORD extracts the word-number. */
462 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
463 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
465 /* 1 if the REG contained in SUBREG_REG is already known to be
466 sign- or zero-extended from the mode of the SUBREG to the mode of
467 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
470 When used as a LHS, is means that this extension must be done
471 when assigning to SUBREG_REG. */
473 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
474 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
476 /* Access various components of an ASM_OPERANDS rtx. */
478 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
479 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
480 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
481 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
482 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
483 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
484 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
485 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
486 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
487 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
488 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
490 /* For a MEM rtx, 1 if it's a volatile reference.
491 Also in an ASM_OPERANDS rtx. */
492 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
494 /* For a MEM rtx, 1 if it refers to a structure or union component. */
495 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
497 /* For a LABEL_REF, 1 means that this reference is to a label outside the
498 loop containing the reference. */
499 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
501 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
502 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
503 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
505 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
506 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
508 /* For a REG, 1 means the register is used only in an exit test of a loop. */
509 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
511 /* During sched, for an insn, 1 means that the insn must be scheduled together
512 with the preceding insn. */
513 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
515 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
516 cost of the dependence link. The cost of executing an instruction
517 may vary based on how the results are used. LINK_COST_ZERO is 1 when
518 the cost through the link varies and is unchanged (i.e., the link has
519 zero additional cost). LINK_COST_FREE is 1 when the cost through the
520 link is zero (i.e., the link makes the cost free). In other cases,
521 the adjustment to the cost is recomputed each time it is needed. */
522 #define LINK_COST_ZERO(X) ((X)->jump)
523 #define LINK_COST_FREE(X) ((X)->call)
525 /* For a SET rtx, SET_DEST is the place that is set
526 and SET_SRC is the value it is set to. */
527 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
528 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
530 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
531 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
533 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
534 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
536 /* Flag in a SYMBOL_REF for machine-specific purposes. */
537 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
539 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
540 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
542 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
543 of the function that is not involved in copying parameters to
544 pseudo-registers. FIRST_PARM_INSN is the very first insn of
545 the function, including the parameter copying.
546 We keep this around in case we must splice
547 this function into the assembly code at the end of the file.
548 FIRST_LABELNO is the first label number used by the function (inclusive).
549 LAST_LABELNO is the last label used by the function (exclusive).
550 MAX_REGNUM is the largest pseudo-register used by that function.
551 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
552 POPS_ARGS is the number of bytes of input arguments popped by the function
553 STACK_SLOT_LIST is the list of stack slots.
554 FUNCTION_FLAGS are where single-bit flags are saved.
555 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
556 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
557 for the function arguments.
558 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
561 We want this to lay down like an INSN. The PREV_INSN field
562 is always NULL. The NEXT_INSN field always points to the
563 first function insn of the function being squirreled away. */
565 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
566 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
567 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
568 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
569 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
570 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
571 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
572 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
573 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
574 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
575 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
576 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
577 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
579 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
580 for the function and which must be `or'ed into the current flag values when
581 insns from that function are being inlined. */
583 /* These ought to be an enum, but non-ANSI compilers don't like that. */
584 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
585 #define FUNCTION_FLAGS_CALLS_SETJMP 02
586 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
587 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
588 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
589 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
590 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
591 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
592 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
593 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
595 /* Define a macro to look for REG_INC notes,
596 but save time on machines where they never exist. */
598 /* Don't continue this line--convex cc version 4.1 would lose. */
599 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
600 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
602 #define FIND_REG_INC_NOTE(insn, reg) 0
605 /* Indicate whether the machine has any sort of auto increment addressing.
606 If not, we can avoid checking for REG_INC notes. */
608 /* Don't continue this line--convex cc version 4.1 would lose. */
609 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
613 /* Generally useful functions. */
615 /* The following functions accept a wide integer argument. Rather than
616 having to cast on every function call, we use a macro instead, that is
617 defined here and in tree.h. */
620 #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
621 #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
624 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
626 #define plus_constant_for_output(X,C) \
627 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
629 extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT));
630 extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
632 #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (N))
635 /* We cannot define prototypes for the variable argument functions,
636 since they have not been ANSI-fied, and an ANSI compiler would
637 complain when compiling the definition of these functions. */
639 extern rtx gen_rtx PROTO((enum rtx_code, enum machine_mode, ...));
640 extern rtvec gen_rtvec PROTO((int, ...));
643 extern rtx gen_rtx ();
644 extern rtvec gen_rtvec ();
647 #ifdef BUFSIZ /* stdio.h has been included */
648 extern rtx read_rtx PROTO((FILE *));
650 extern rtx read_rtx ();
654 /* At present, don't prototype xrealloc, since all of the callers don't
655 cast their pointers to char *, and all of the xrealloc's don't use
657 extern char *xmalloc PROTO((size_t));
658 extern char *xrealloc PROTO((void *, size_t));
660 extern char *xmalloc ();
661 extern char *xrealloc ();
664 extern char *oballoc PROTO((int));
665 extern char *permalloc PROTO((int));
666 extern void free PROTO((void *));
667 extern rtx rtx_alloc PROTO((RTX_CODE));
668 extern rtvec rtvec_alloc PROTO((int));
669 extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx));
670 extern rtx find_regno_note PROTO((rtx, enum reg_note, int));
671 extern HOST_WIDE_INT get_integer_term PROTO((rtx));
672 extern rtx get_related_value PROTO((rtx));
673 extern rtx single_set PROTO((rtx));
674 extern rtx find_last_value PROTO((rtx, rtx *, rtx));
675 extern rtx copy_rtx PROTO((rtx));
676 extern rtx copy_rtx_if_shared PROTO((rtx));
677 extern rtx copy_most_rtx PROTO((rtx, rtx));
678 extern rtx replace_rtx PROTO((rtx, rtx, rtx));
679 extern rtvec gen_rtvec_v PROTO((int, rtx *));
680 extern rtx gen_reg_rtx PROTO((enum machine_mode));
681 extern rtx gen_label_rtx PROTO((void));
682 extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int, int, int, rtx, int, int, rtvec, rtx));
683 extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
684 extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
685 extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
686 extern rtx gen_highpart PROTO((enum machine_mode, rtx));
687 extern rtx gen_realpart PROTO((enum machine_mode, rtx));
688 extern rtx gen_imagpart PROTO((enum machine_mode, rtx));
689 extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
690 extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
691 extern int subreg_lowpart_p PROTO((rtx));
692 extern rtx make_safe_from PROTO((rtx, rtx));
693 extern rtx memory_address PROTO((enum machine_mode, rtx));
694 extern rtx get_insns PROTO((void));
695 extern rtx get_last_insn PROTO((void));
696 extern rtx get_last_insn_anywhere PROTO((void));
697 extern void start_sequence PROTO((void));
698 extern void push_to_sequence PROTO((rtx));
699 extern void end_sequence PROTO((void));
700 extern rtx gen_sequence PROTO((void));
701 extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
702 extern rtx force_const_mem PROTO((enum machine_mode, rtx));
703 extern rtx force_reg PROTO((enum machine_mode, rtx));
704 extern rtx get_pool_constant PROTO((rtx));
705 extern enum machine_mode get_pool_mode PROTO((rtx));
706 extern int get_pool_offset PROTO((rtx));
707 extern rtx simplify_subtraction PROTO((rtx));
708 extern rtx assign_stack_local PROTO((enum machine_mode, int, int));
709 extern rtx assign_stack_temp PROTO((enum machine_mode, int, int));
710 extern rtx protect_from_queue PROTO((rtx, int));
711 extern void emit_queue PROTO((void));
712 extern rtx emit_move_insn PROTO((rtx, rtx));
713 extern rtx emit_insn_before PROTO((rtx, rtx));
714 extern rtx emit_jump_insn_before PROTO((rtx, rtx));
715 extern rtx emit_call_insn_before PROTO((rtx, rtx));
716 extern rtx emit_barrier_before PROTO((rtx));
717 extern rtx emit_note_before PROTO((int, rtx));
718 extern rtx emit_insn_after PROTO((rtx, rtx));
719 extern rtx emit_jump_insn_after PROTO((rtx, rtx));
720 extern rtx emit_barrier_after PROTO((rtx));
721 extern rtx emit_label_after PROTO((rtx, rtx));
722 extern rtx emit_note_after PROTO((int, rtx));
723 extern rtx emit_line_note_after PROTO((char *, int, rtx));
724 extern rtx emit_insn PROTO((rtx));
725 extern rtx emit_insns PROTO((rtx));
726 extern rtx emit_insns_before PROTO((rtx, rtx));
727 extern rtx emit_jump_insn PROTO((rtx));
728 extern rtx emit_call_insn PROTO((rtx));
729 extern rtx emit_label PROTO((rtx));
730 extern rtx emit_barrier PROTO((void));
731 extern rtx emit_line_note PROTO((char *, int));
732 extern rtx emit_note PROTO((char *, int));
733 extern rtx emit_line_note_force PROTO((char *, int));
734 extern rtx make_insn_raw PROTO((rtx));
735 extern rtx previous_insn PROTO((rtx));
736 extern rtx next_insn PROTO((rtx));
737 extern rtx prev_nonnote_insn PROTO((rtx));
738 extern rtx next_nonnote_insn PROTO((rtx));
739 extern rtx prev_real_insn PROTO((rtx));
740 extern rtx next_real_insn PROTO((rtx));
741 extern rtx prev_active_insn PROTO((rtx));
742 extern rtx next_active_insn PROTO((rtx));
743 extern rtx prev_label PROTO((rtx));
744 extern rtx next_label PROTO((rtx));
745 extern rtx next_cc0_user PROTO((rtx));
746 extern rtx prev_cc0_setter PROTO((rtx));
747 extern rtx reg_set_last PROTO((rtx, rtx));
748 extern rtx next_nondeleted_insn PROTO((rtx));
749 extern enum rtx_code reverse_condition PROTO((enum rtx_code));
750 extern enum rtx_code swap_condition PROTO((enum rtx_code));
751 extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
752 extern enum rtx_code signed_condition PROTO((enum rtx_code));
753 extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
754 extern rtx squeeze_notes PROTO((rtx, rtx));
755 extern rtx delete_insn PROTO((rtx));
756 extern void delete_jump PROTO((rtx));
757 extern rtx get_label_before PROTO((rtx));
758 extern rtx get_label_after PROTO((rtx));
759 extern rtx follow_jumps PROTO((rtx));
760 extern rtx adj_offsettable_operand PROTO((rtx, int));
761 extern rtx try_split PROTO((rtx, rtx, int));
762 extern rtx split_insns PROTO((rtx, rtx));
763 extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
764 extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
765 extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
766 extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
767 extern rtx nonlocal_label_rtx_list PROTO((void));
768 extern rtx gen_move_insn PROTO((rtx, rtx));
769 extern rtx gen_jump PROTO((rtx));
770 extern rtx gen_beq PROTO((rtx));
771 extern rtx gen_bge PROTO((rtx));
772 extern rtx gen_ble PROTO((rtx));
773 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
774 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
776 /* Maximum number of parallel sets and clobbers in any insn in this fn.
777 Always at least 3, since the combiner could put that many togetherm
778 and we want this to remain correct for all the remaining passes. */
780 extern int max_parallel;
782 extern int asm_noperands PROTO((rtx));
783 extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *));
785 extern enum reg_class reg_preferred_class PROTO((int));
786 extern enum reg_class reg_alternate_class PROTO((int));
788 extern rtx get_first_nonparm_insn PROTO((void));
790 /* Standard pieces of rtx, to be substituted directly into things. */
793 extern rtx const0_rtx;
794 extern rtx const1_rtx;
795 extern rtx const2_rtx;
796 extern rtx constm1_rtx;
797 extern rtx const_true_rtx;
799 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
801 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
804 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
806 /* Likewise, for the constants 1 and 2. */
808 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
809 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
811 /* All references to certain hard regs, except those created
812 by allocating pseudo regs into them (when that's possible),
813 go through these unique rtx objects. */
814 extern rtx stack_pointer_rtx;
815 extern rtx frame_pointer_rtx;
816 extern rtx arg_pointer_rtx;
817 extern rtx pic_offset_table_rtx;
818 extern rtx struct_value_rtx;
819 extern rtx struct_value_incoming_rtx;
820 extern rtx static_chain_rtx;
821 extern rtx static_chain_incoming_rtx;
823 /* Virtual registers are used during RTL generation to refer to locations into
824 the stack frame when the actual location isn't known until RTL generation
825 is complete. The routine instantiate_virtual_regs replaces these with
826 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
829 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
831 /* This points to the first word of the incoming arguments passed on the stack,
832 either by the caller or by the callee when pretending it was passed by the
835 extern rtx virtual_incoming_args_rtx;
837 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
839 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
840 variable on the stack. Otherwise, it points to the first variable on
843 extern rtx virtual_stack_vars_rtx;
845 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
847 /* This points to the location of dynamically-allocated memory on the stack
848 immediately after the stack pointer has been adjusted by the amount
851 extern rtx virtual_stack_dynamic_rtx;
853 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
855 /* This points to the location in the stack at which outgoing arguments should
856 be written when the stack is pre-pushed (arguments pushed using push
857 insns always use sp). */
859 extern rtx virtual_outgoing_args_rtx;
861 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
863 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
865 extern rtx find_next_ref PROTO((rtx, rtx));
866 extern rtx *find_single_use PROTO((rtx, rtx, rtx *));
868 /* It is hard to write the prototype for expand_expr, since it needs
869 expr.h to be included for the enumeration. */
871 extern rtx expand_expr ();
872 extern rtx immed_real_const_1();
875 /* rtl.h and tree.h were included. */
876 extern rtx output_constant_def PROTO((tree));
877 extern rtx immed_real_const PROTO((tree));
878 extern rtx immed_real_const_1 PROTO((REAL_VALUE_TYPE, enum machine_mode));
879 extern tree make_tree PROTO((tree, rtx));
882 extern rtx output_constant_def ();
883 extern rtx immed_real_const ();
884 extern rtx immed_real_const_1 ();
887 /* Define a default value for STORE_FLAG_VALUE. */
889 #ifndef STORE_FLAG_VALUE
890 #define STORE_FLAG_VALUE 1
893 /* Nonzero after end of reload pass.
894 Set to 1 or 0 by toplev.c. */
896 extern int reload_completed;
898 /* Set to 1 while reload_as_needed is operating.
899 Required by some machines to handle any generated moves differently. */
901 extern int reload_in_progress;
903 /* If this is nonzero, we do not bother generating VOLATILE
904 around volatile memory references, and we are willing to
905 output indirect addresses. If cse is to follow, we reject
906 indirect addresses so a useful potential cse is generated;
907 if it is used only once, instruction combination will produce
908 the same indirect address eventually. */
909 extern int cse_not_expected;
911 /* Indexed by pseudo register number, gives the rtx for that pseudo.
912 Allocated in parallel with regno_pointer_flag. */
913 extern rtx *regno_reg_rtx;
915 /* Translates rtx code to tree code, for those codes needed by
917 extern int rtx_to_tree_code ();